AI Move To Bug

I Think this is a Bug.

This works only when it is not spawnt. So if I place it in the world. But Why !? I would like to use this script, but the NPC does not run when it is being spawned by another actor. Without Error.
2016-12-31 18_56_41-KrabblerBaby_.jpg

If I spawn it, it only works with this script.
2016-12-31 18_58_19-EierSpawnBaby_.jpg